diff --git a/ets2panda/checker/ets/helpers.cpp b/ets2panda/checker/ets/helpers.cpp
index f7a520764e69a21025157c8f529f447c5d0c7d66..7fa033704e2ef4f889ed4721c9d5a96b5c099b99 100644
--- a/ets2panda/checker/ets/helpers.cpp
+++ b/ets2panda/checker/ets/helpers.cpp
@@ -2174,7 +2174,7 @@ bool IsConstantMemberOrIdentifierExpression(ir::Expression *expression, bool che
         var = expression->AsMemberExpression()->PropVar();
     }
 
-    if (var == nullptr) {
+    if (var == nullptr || var->TsType() == nullptr) {
         return false;
     }
     bool isConst = checkForConst ? (var->TsType()->HasTypeFlag(checker::TypeFlag::CONSTANT)) : true;
diff --git a/ets2panda/test/ast/compiler/ets/fuzzingtest6.ets b/ets2panda/test/ast/compiler/ets/fuzzingtest6.ets
new file mode 100644
index 0000000000000000000000000000000000000000..78039871f5fe8bff679e887742bce9dc96b2fa23
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/fuzzingtest6.ets
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+function foo(s: string) {
+    let a1 = A.a;
+    let a2 = B.a;
+    switch (s) {
+        case a1:
+            break;
+        case a2:
+            break;
+        default:
+            break;
+    }
+}
+
+/* @@? 17:14 Error TypeError: Unresolved reference A */
+/* @@? 18:14 Error TypeError: Unresolved reference B */
\ No newline at end of file